COMPONENT NUMBER CODE CHARTS v.1

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COMPONENT

NUMBER CODE CHARTS

v.1

Use the following charts to calculate component values for number

coded resistors, capacitors and inductors. The charts included are for

3- and 4-digit chip resistors; chip resistor decimals and symbols;

numbered resistors with tolerance letter codes; E96 series, 0603

resistors; digit capacitors; 2-digit alphanumeric chip capacitors;

3-digit inductors; and capacitor and inductor decimals.

These charts can be used for the

exercises

in DVD-165C, for the

Review Questions

and for the

IPC

Training Certification

Exam.

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3-DIGIT CHIP RESISTOR NUMBER CODE CHART

100Ω + 5%

3-DIGIT VALUE CODE + 5% Tolerance

Resistors are measured in “ohms.” The symbol for ohms is Ω

.

You may also see

the value of a resistor expressed as “K” ohms or “M” ohms. K stands for

Kilo-ohms or one thousand Kilo-ohms, and M stands for Meg-Kilo-ohms or one million Kilo-ohms.

Therefore: a 10,000 ohm resistor can be abbreviated as 10K for 10 Kilo-ohms.

In the same manner a 6,000,000 ohm resistor can be abbreviated as 6M, for 6

Meg-ohms.

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4-DIGIT CHIP RESISTOR NUMBER CODE CHART

100KΩ + 1%

4-DIGIT VALUE CODE + 1% Tolerance

Resistors are measured in “ohms.” The symbol for ohms is Ω

.

You may also see

the value of a resistor expressed as “K” ohms or “M” ohms. K stands for

Kilo-ohms or one thousand Kilo-ohms, and M stands for Meg-Kilo-ohms or one million Kilo-ohms.

Therefore: a 100,000 ohm resistor can be abbreviated as 100K for 100

Kilo-ohms. In the same manner a 6,000,000 ohm resistor can be abbreviated as 6M,

for 6 Meg-ohms.

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DECIMALS AND SYMBOLS FOR

3- AND 4-DIGIT RESISTORS

7.6 Ω

+ 5%

15.2 Ω

+ 1%

When the letter R is used as part of a 3- or 4-digit number code, it indicates the position of a decimal point. For example, a 3-digit code of 4R3 would be decoded as 4.3 Ω. If the code is R43, the value would be .43 Ω. And a 4-digit number code of 65R5 would be decoded as 65.5 Ω. When a letter code is used to indicate a decimal point, there is no multiplier.

3.2K

Ω

+ 5% 29.5K

Ω

+ 1%

The letter K also indicates the position of a decimal point in 3- and 4-digit number codes. The difference is that the value will be measured in kilo-ohms. For example, 8K9 would be 8.9K Ω. When a letter code is used to indicate a decimal point, there is no multiplier.

1.5M

Ω

+ 5% 20m

Ω

+ 1%

Decimal points can also beindicated by the letters M and L. M is used when the value is measured in meg-ohms and L is used when the value will be measured in milli-ohms. When a letter code is used to indicate a decimal point, there is no multiplier.

27,800

Ω or 27.8KΩ

+ 1%

Some number codes use the colon symbol, or two small boxes to represent the number 8. For example, the 3-character code:53 equals 853. The two value numbers are 85. The multiplier is 3 – so three zeros added after 85 gives the value 85,000 Ω, or 85K Ω. As long as there is no letter indicating a decimal point, 3- and 4-character codes

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AXIAL RESISTOR VALUE AND TOLERANCE CODES

6MΩ + 1%

Resistors are measured in “ohms.” The symbol for ohms is Ω

.

You may also see

the value of a resistor expressed as “K” ohms or “M” ohms. K stands for

Kilo-ohms or one thousand Kilo-ohms, and M stands for Meg-Kilo-ohms or one million Kilo-ohms.

Therefore: a 100,000 ohm resistor can be abbreviated as 100K for 100

Kilo-ohms. In the same manner a 6,000,000 ohm resistor can be abbreviated as 6M,

for 6 Meg-ohms.

These axial resistors typically have a single letter code to the right of the number

code to indicate tolerance.

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E96 SERIES, 0603, + 1%

CHIP RESISTORS

340 Ω

+ 1%

E96 Value Code Chart

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CAPACITOR VALUE AND TOLERANCE CHART

47,000,000pF or 47μF, 10V, + 10%

Capacitors are measured in “farads.” There are picofarads (pF), nanofarads

(nF), and microfarads (µF).

3-digit capacitors are always calculated in picofarads – the smallest unit of

measurement.

Tolerance is typically indicated by a letter code. When tolerance is not specified,

it is assumed to be + 20%.

Equivalents: 1,000,000pF (picofarads) = 1,000nF (nanofarads) = 1µF

(microfarad)

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2-DIGIT ALPHANUMERIC CHIP CAPACITOR CHART

1,800pF + 20%

2-digit alphanumeric chip capacitors are always calculated in picofarads – the

smallest unit of measurement. Unless otherwise indicated, tolerance is + 20%.

Equivalents: 1,000,000pF (picofarads) = 1,000nF (nanofarads) = 1µF

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INDUCTOR VALUE AND TOLERANCE CHART

270μH + 2%

Inductors are measured in “henries.”

There are nanohenries (nH), microhenries (µH), and millihenries (mH). The

value of numbered inductors is calculated in microhenries, unless otherwise

indicated.

Tolerance may be indicated by a letter code. When tolerance is not specified, it

is assumed to be + 20%.

Equivalents: 1,000,000nH (nanohenries) = 1,000µH (microhenries) = 1mH

(millihenry)

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DECIMALS FOR CAPACITORS AND INDUCTORS

.47μF + 20%

Capacitors are measured in “farads.” There are picofarads (pF), nanofarads

(nF), and microfarads (µF). Unless otherwise indicated, the default tolerance is

+ 20%.

On capacitors, µ or N is used to indicate the position of a decimal point. A µ